正交频分复用系统自适应分配算法分析  

Analysis of Adaptive Loading Algorithms in Orthogonal Frequency Division Multiplexing Systems

作　　者：杨蕾[1,2] 张友爱[1,2] 

机构地区：[1]武汉工业学院,武汉430023 [2]武汉船舶通信研究所,武汉430079

出　　处：《系统仿真学报》2009年第3期761-763,767,共4页Journal of System Simulation

基　　金：船舶工业国防科技预言基金项目(3.7.3)

摘　　要：提出了两种自适应分配改进算法,这两种方法均适用于短波宽带正交频分复用(OFDM)系统。改进算法1对Ficsher算法进行了改进,弥补了Fischer算法不能应用在短波宽带信道下的重大缺陷;改进算法2对Chow算法进行了改进,弥补了Chow算法不能应用于严重频率选择性衰落信道和低信噪情况下的缺陷。计算机仿真了短波宽带信道背景下的固定OFDM算法、Chow算法和两种改进算法,仿真结果表明,改进算法要远远好于固定OFDM算法,改进算法1性能较好,计算简单,改进算法2性能较改进算法1好,但计算较为复杂。Two adaptive improved algorithms were proposed, they are suitable for shortwave broadband orthogonal frequency division multiplexing （OFDM） system. Improved algorithm l filled up a deficiency of Fischer＇s algorithm which is not suitable for shortwave broadband OFDM system. Improved algorithm 2 filled up two deficiencies of Chow＇s algorithm which can not be used in severe frequency selective fading channel and low SNR condition. The fixed OFDM algorithm, improved algorithm 1 and improved algorithm 2 were simulated on the shortwave broadband channel. The simulation result shows that the improved algorithm 1 has a lower performance than improved algorithm 2 but smaller calculation, and improved algorithm 2 has a good performance but large calculation.

关 键 词：OFDM 自适应分配 短波 宽带 

分 类 号：TP911[自动化与计算机技术]